Malicious PDF — malware analysis report

Static analysis result for SHA-256 0866f080ca102ce3…

MALICIOUS

PDF

74.1 KB Created: 2021-05-21 19:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb8d4c4ea5c41ab159099006ea201f9a SHA-1: d4f486c58d6c2ad20a4624917bba6a6cd34112c4 SHA-256: 0866f080ca102ce3e56e90baa4121ee5897ebe46ffc0f4f2cc640316b89428e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to download files from compromised WordPress sites, disguised as a free game ROM download. The presence of multiple URLs pointing to potentially compromised CMS upload directories suggests a distribution mechanism for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8985b7f4f---nezexi.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/879a11abe61c79a398ad1393efc717cc/26195284357.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0f7a3ckveomjit16q7mcusqpbi/nigixovimanonofalevuk.pdf
    • http://stlnsk.ru/uploads/file/pavopefemuludixoxizu.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8218adf99cf08aee5fdf05a1c0fcb823/bemutigenetusubulenimuvor.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe4740a37---pelosanop.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a02313e72d2---juvikan.pdf
    • http://angarakshaksecurity.com/userfiles/file/61930186546.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0uemrkn2fh4bo9pqseepcdcd99/tidegili.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749c1181729---80342815538.pdf
    • http://sotel-perm.ru/site/file/kesapotikakagubojotuwusu.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/i4ms4s9ojcp5sujn66377nhreo/ruzadugekijamapu.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/k4g934l20p2jchcbl1d7fmseph/vunamugupuzegunemuxafuxir.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/19fafad4221fa1458aa96732fd9a6382/bapibo.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/363cf12b49ec5d181e4d53461bd9c63d/pixafulutusuvefinizaliti.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2514bd37717c5827e83d54b7073a1269/85658053110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+super+fire+red+gba+rom+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45d.bin
0e796531a2a214881d5ea612bbd4ea0c049e6a18a3f89754b4de39d6920b7907
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 5660 bytes
font_01_sfnt_off0000f79e.bin
8900c82c7569bc1274a46e95aa67cb9f3ff42c72f65c2fa1608a72adf04791f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10408 bytes